Monitor Developer Spending on Google Cloud Projects

C.

The correct answer for this scenario is Option C: Create a budget per project and configure budget alerts on all of these budgets.

Option A, creating a single budget for all projects, will not allow you to monitor individual developer spending. You would only be alerted if the total spending across all projects exceeded $500 per month.

Option B, creating a separate billing account per sandbox project and enabling BigQuery billing exports, will allow you to monitor spending per billing account, but this approach is not practical for monitoring a large number of projects. Additionally, you would need to create a separate dashboard for each billing account, which could be difficult to manage.

Option D, creating a single billing account for all sandbox projects and enabling BigQuery billing exports, is similar to Option B and suffers from the same drawbacks.

Therefore, the best approach is to create a budget per project and configure budget alerts on all of these budgets. This will allow you to monitor spending on a per-project basis and receive alerts if any project exceeds the $500 threshold. Here are the steps to implement this approach:

1. Log in to the Google Cloud Console and navigate to the Billing page.
2. Create a budget for each sandbox project by clicking the "Create budget" button.
3. Set the budget amount to $500 for each project.
4. Configure budget alerts by clicking the "Configure alerts" button. Set the alert threshold to $500 and choose your notification preferences (e.g., email, SMS).
5. Repeat these steps for each sandbox project.

By following this approach, you can easily monitor individual developer spending and take action if necessary to keep costs under control.